I have a problem with my 4.2/YP-GI1
"Music", the default music player automatically starts playing when the screen locks.

It only happens when the earphones are plugged is and the application has been open before, so it's running in the background.
I just can't figure out why it happens. Can't find settings in Music Player for this, and never happened with other music applications, like Poweramp, PlayerPro.

I usually don't use Music, but when I open it (mostly accidentally), i have to go to Manage Applications to close it, preventing it from from starting automatically on lockscreen.